A multi-layer multi-point uniform feeding device for adsorbent for purification of electrolysis flue gas

Abstract

The utility model discloses a kind of adsorbent multilayer multi-point uniform feeding device for electrolytic flue gas purification, it is related to electrolytic flue gas defluorination purification field, to solve the problem of high economic cost in prior art defluorination equipment, the technical scheme used is, multilayer air slide is set outside dust collector, and multiple feeding points are set on the air duct of each dust collector.The flue gas in air duct is contacted with the alumina powder of lower layer feeding after defluorination, and then contacted with the alumina powder of upper layer feeding, so that the defluorination efficiency is higher, and excellent defluorination effect can be achieved with less flue gas purification equipment.

Description

Technical Field

[0001] This utility model relates to the field of flue gas purification technology, specifically to a multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification. Background Technology

[0002] In the electrolytic aluminum industry, the flue gas generated in the electrolysis workshop is sent to a dust removal workshop for dust removal. Before dust removal, alumina powder is added into the ductwork for adsorption and defluorination of the flue gas. In existing alumina feeding devices, the powder is fed from the same height. A large amount of alumina powder comes into contact with and adsorbs hydrogen fluoride in the flue gas. If the amount of alumina added is small, the adsorption capacity will be small; if the amount added is large, the contact area with the flue gas will be small, resulting in a large waste of alumina. Therefore, the amount of alumina added is generally controlled at 10m³. 3 2 tons of alumina powder are fed into the flue gas per hour. Because alumina causes significant wear on the equipment, even if staggered baffles or inclined guide plates are used to increase the residence time of alumina in the flue, the continuous impact and friction of the alumina powder during production will result in a very short lifespan for the baffles or guide plates. A 10mm thick steel plate will develop holes after only two months of use, requiring frequent replacement. This leads to high material, personnel, and time costs, and production cannot be sustained. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide a multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, this utility model discloses a multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification. The technical solution includes a silo and a dust collector. The dust collector has a longitudinal air duct connected to a dust removal mechanism within it. The outer wall of the dust collector has a pneumatic chute connected to the silo and a gas supply pipe. Multiple pneumatic chutes are arranged in layers on the outer wall of the dust collector. Each dust collector has multiple feeding structures connected to it. The feeding structures of the multi-layer pneumatic chutes correspond vertically, with each corresponding column connected to the same longitudinal air duct. Each feeding structure has a feeding control component. An exhaust pipe is also connected to the pneumatic chute and is connected to the air duct. The multi-layered pneumatic chutes and feeding device enable multi-stage absorption of flue gas in the air duct, achieving better purification without increasing the number of flue gas purification devices, thereby reducing the investment cost of flue gas purification equipment.

[0005] In a preferred embodiment of this invention, the pneumatic chute comprises a first pneumatic chute, a second pneumatic chute, and a third pneumatic chute. The first pneumatic chute is connected to the silo. The second and third pneumatic chutes are arranged vertically outside the dust collector. The first and second pneumatic chutes are connected in communication. The second pneumatic chute is connected to a bypass discharge pipe, which is connected to the third pneumatic chute. The bypass discharge pipe allows residual alumina powder from the upper pneumatic chute to be fed into the lower pneumatic chute for continued use.

[0006] In a preferred embodiment of this invention, the pneumatic chute includes a material conveying chute and an air conveying chute. The air conveying chute is located below the material conveying chute, and a fluidized bed is placed between them. The material conveying chute and the air conveying chute are connected through ventilation holes on the fluidized bed. The airflow in the air conveying chute can transport the alumina powder in the material conveying chute.

[0007] As a preferred technical solution of this utility model, the air supply pipe includes a main air supply pipe, a first air supply pipe and a second air supply pipe. The main air supply pipe is connected to the first pneumatic chute, the first air supply pipe and the second air supply pipe. The first air supply pipe is connected to the second pneumatic chute. The second air supply pipe is connected to the third pneumatic chute. The main air supply pipe is connected to an air source.

[0008] In a preferred embodiment of this invention, a branch pipe of an air inlet pipe is connected to the first air supply pipe, a first connecting pipe is connected to the air duct, a first valve is installed on the first connecting pipe, and a first flexible hose is installed between the first connecting pipe and the branch pipe. Airflow is introduced into the pneumatic chute through the branch pipe.

[0009] As a preferred embodiment of this utility model, a bypass connector is connected to the side of the material feeding chute, and a bypass discharge pipe is connected between the bypass connector of the upper pneumatic chute and the bypass connector of the lower pneumatic chute.

[0010] In a preferred embodiment of this invention, the feeding structure is located on the side of the feeding chute. The feeding structure includes a distribution bin, which is open on its side and connected to the feeding chute. A slit is formed in the side wall of the feeding chute, and a baffle is slidably attached to the outer side wall of the feeding chute. The baffle corresponds to the position of the slit and is connected to an actuating component. By opening the slit with the actuating component, alumina powder in the feeding chute can enter the distribution bin through the slit and then into the air duct.

[0011] As a preferred technical solution of this utility model, the actuating component is one of the following: manual opening and closing structure, pneumatic opening and closing structure, hydraulic opening and closing structure, and electric opening and closing structure.

[0012] The manual opening and closing structure can adopt a handwheel screw opening and closing structure, in which the screw and the baffle are connected by a bearing, and a nut is installed on the material distribution bin, with the screw and nut meshing; the pneumatic opening and closing structure and the hydraulic starting structure use a cylinder or hydraulic cylinder to drive the baffle to rise and fall, and the electric opening and closing structure uses an electric cylinder to drive the baffle to rise and fall, or the handwheel in the handwheel screw opening and closing structure is replaced with a reducer driven by a motor.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting up multi-layer pneumatic chutes and feeding devices on the dust removal equipment, the alumina powder can be fed down in layers. Setting up multiple feeding points can make the alumina more evenly distributed in the air duct. This allows the flue gas in the air duct to fully contact the alumina powder fed in the lower layer for defluorination, and then contact the alumina powder fed in the upper layer for defluorination, thereby making the defluorination efficiency higher and achieving excellent defluorination effect with less flue gas purification equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is an enlarged structural diagram of point A in this utility model;

[0016] Figure 3 This is an enlarged structural diagram of section B of the present invention;

[0017] Figure 4 This is a schematic diagram of the structure for feeding material into the flue via a pneumatic chute according to this utility model;

[0018] Figure 5 This is a schematic diagram of the test structure for the material feeding structure of this utility model;

[0019] Figure 6 This is a schematic diagram of the internal structure of the material feeding structure of this utility model.

[0020] In the diagram: 1. Hopper; 2. Dust collector; 201. Air duct; 3. First pneumatic chute; 301. Material conveying chute; 302. Air conveying chute; 303. Bypass connector; 304. Distribution hopper; 305. Slit; 306. Baffle; 307. Actuating component; 308. Discharge port; 4. Main air supply pipe; 5. Exhaust pipe; 6. Second pneumatic chute; 7. Bypass discharge pipe; 8. Third pneumatic chute; 9. First air supply pipe; 10. Second air supply pipe; 11. Feed pipe; 12. Sleeve; 13. Second flexible hose; 14. Air inlet pipe; 1401. Branch pipe; 1402. First flexible hose; 1403. First connecting pipe; 1404. First valve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0022] like Figures 1 to 6 As shown, this utility model discloses a multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification. The technical solution adopted includes a silo 1 and a dust collector 2. The silo 1 is connected to a first pneumatic chute 3, which includes a material conveying chute 301 and an air conveying chute 302. The air conveying chute 302 is below the material conveying chute 301, and a boiling plate is installed between the two. The material conveying chute 301 and the air conveying chute 302 are connected through ventilation holes on the boiling plate. A first connecting pipe 1403 of an air inlet pipe 14 is connected to the lower part of the air conveying chute 302. A first valve 1404 is installed on the first connecting pipe 1403. The lower end of the first connecting pipe 1403 is connected to a branch pipe 1401 through a first flexible hose 1402. The branch pipe 1401 is connected to a main air supply pipe 4, which is connected to an air source to supply air to the air conveying chute 302, thereby realizing the flow and conveying of alumina powder in the material conveying chute 301.

[0023] Dust collector 2 is a bag filter dust collection system. Dust collector 2 has a longitudinal air duct 201 inside, with the front end of the air duct 201 at the bottom and the rear end at the top. Dust collector 2 is equipped with a second air chute 6 and a third air chute 8 outside, with the second air chute 6 on top and the third air chute 8 on the bottom, forming a two-layer cloth system. The structure of the second air chute 6 and the third air chute 8 is the same as that of the first air chute 3. There is a first air supply pipe 9 below the second air chute 6 and a second air supply pipe 10 below the third air chute 8. The first air supply pipe 9 and the second air supply pipe 10 are both connected to the main air supply pipe 4. The first air supply pipe 9 and the second air supply pipe 10 are connected to the second air chute 6 and the third air chute 8 respectively through the air inlet pipe 14.

[0024] The material feed chute 301 of the first pneumatic chute 3 is connected to the material feed chute 301 of the second pneumatic chute 6. A bypass connector 303 is connected to the side of the material feed chute 301 of the second pneumatic chute 6 and the third pneumatic chute 8 away from the dust collector 2, and a distribution bin 304 is connected to the side of the material feed chute 301 closer to the dust collector 2. The side of the bypass connector 303 is connected to the material feed chute 301. A second connecting pipe is connected to the bottom of the bypass connector 303 of the second pneumatic chute 6. After the second connecting pipe is connected to the second valve, it is connected to the bypass discharge pipe 7 through a third flexible hose. The bypass discharge pipe 7 is connected to the bypass connector 303 of the third pneumatic chute 8. The remaining alumina powder in the second pneumatic chute 6 will enter the third pneumatic chute 8 through the bypass connector 303 and the bypass discharge pipe 7 for continued conveying. By adjusting the feed rate, the alumina powder in the pneumatic chute is balanced in its inflow and outflow, thereby maintaining a relatively constant material height in the pneumatic chute.

[0025] like Figures 4 to 6 As shown, a slit 305 is provided on one side of the material conveying chute 301 connected to the distribution bin 304. The slit 305 is longitudinally oriented, and there are U-shaped grooves on both sides of the slit 305. A baffle 306 slides in contact with the U-shaped groove. The baffle 306 is an L-shaped plate, including a horizontal plate and a vertical plate. The vertical plate slides in contact with the outer wall of the material conveying chute 301. An actuating component 307 is connected to the horizontal plate. The actuating component 307 is a handwheel screw opening and closing mechanism, including a handwheel and a screw. The handwheel is connected to the screw, and the lower end of the screw is rotatably connected to the horizontal plate of the baffle 306 through a bearing. The top surface of the distribution bin 304 has a through hole, and a tubular housing is installed on top. The screw passes through the through hole and the tubular housing. A nut is fixedly connected to the top of the tubular housing, and the screw and nut mesh with each other. Rotating the handwheel drives the screw to rotate, which can drive the baffle 306 to rise and fall along the U-shaped groove, thereby changing the opening and closing state of the slit 305. The bottom surface of the material distribution bin 304 is connected to a discharge port 308, which is connected to a second flexible hose 13. The second flexible hose 13 is connected to a feed pipe 11. A sleeve 12 is installed obliquely on the outer wall of the dust collector 2. The sleeve 12 is connected to the air duct 201. The feed pipe 11 is inserted into the sleeve 12 and extends into the air duct 201. Each dust collector 2 has eight feeding points, which are symmetrically arranged on both sides of the dust collector 2.

[0026] The top surfaces of the second pneumatic chute 6 and the third pneumatic chute 8 are also connected to exhaust pipes 5, which extend into the air duct 201, so that the air entering the second pneumatic chute 6 and the third pneumatic chute 8 enters the air duct 201 through the exhaust pipes 5.

[0027] The working principle of this utility model:

[0028] The main air supply pipe 4 supplies air to the first pneumatic chute 3, the second pneumatic chute 6 and the third pneumatic chute 8. The first pneumatic chute 3 sends the alumina powder in the silo 1 into the second pneumatic chute 6. After passing through the second pneumatic chute 6, the alumina powder enters the bypass discharge pipe 7 and flows into the third pneumatic chute 8 to continue flowing.

[0029] Turning the handwheel of the actuating component 307 moves the baffle 306 upward, opening the slit 305. Alumina powder enters the distribution bin 304 through the slit 305, and then enters the air duct 201 through the second hose 13 and the feed pipe 11.

[0030] Inside the duct 201, the flue gas from the electrolysis workshop first comes into contact with the alumina powder fed by the feeding device of the third pneumatic chute 8. The alumina powder adsorbs a large amount of hydrogen fluoride in the flue gas. A small amount of hydrogen fluoride continues to rise through the lower feeding point and comes into contact with the alumina powder fed by the feeding device of the second pneumatic chute 6, where it is adsorbed and defluorinated. The defluorinated flue gas enters the bag filter dust collection system for dust removal. The alumina powder in the flue gas is collected in the ash hopper of the bag filter dust collector and sent to the next process through the pneumatic chute connected to the lower end of the ash hopper.

[0031] A comparison of the defluorination effects between the double-layer multi-point feeding method in Example 1 and the existing single-layer double-point feeding method was conducted:

[0032] Flue gas delivery volume 10m 3 / h, alumina powder input rate 2t / 10m 3 The number of bag filter systems in Dust Collector 2 is 10. The test results are as follows:

[0033]

[0034] As can be seen from the above comparison, Example 1 can significantly improve the defluorination effect without increasing the number of flue gas purification devices.

[0035] Example 2

[0036] The difference between this embodiment and Embodiment 1 is that the screw of the actuating component 307 is driven by a reducer with a motor.

[0037] Example 3

[0038] The difference between this embodiment and Embodiment 1 is that the actuating component 307 is a cylinder.

[0039] Example 4

[0040] The difference between this embodiment and Embodiment 1 is that the actuating component 307 is a hydraulic cylinder.

[0041] The circuits and mechanical connections involved in this utility model are common practices used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments. They are common knowledge.

[0042] Components not described in detail in this article are existing technologies.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification, comprising a silo (1) and a dust collector (2), wherein the dust collector (2) has a longitudinal air duct (201) connected to a dust removal mechanism in the dust collector (2), and the outer wall of the dust collector (2) has a pneumatic chute connected to the silo (1), and the pneumatic chute is connected to an air supply pipe, characterized in that: There are multiple pneumatic chutes, which are arranged in layers on the outer wall of the dust collector (2); each dust collector (2) is connected to multiple feeding structures, and the feeding structures of the multi-layer pneumatic chutes are corresponding to each other, and each column of corresponding feeding structures is connected in the same longitudinal air duct (201); the feeding structure has feeding control components; the pneumatic chutes are also connected to exhaust pipes (5), which are connected to the air ducts (201).

2. The multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification according to claim 1, characterized in that: The pneumatic chute includes a first pneumatic chute (3), a second pneumatic chute (6), and a third pneumatic chute (8). The first pneumatic chute (3) is connected to the silo (1). The second pneumatic chute (6) and the third pneumatic chute (8) are arranged above and below the dust collector (2). The first pneumatic chute (3) is connected to the second pneumatic chute (6). The second pneumatic chute (6) is connected to a bypass discharge pipe (7). The bypass discharge pipe (7) is connected to the third pneumatic chute (8).

3. The multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification according to claim 1 or 2, characterized in that: The pneumatic chute includes a material conveying chute (301) and an air conveying chute (302). The air conveying chute (302) is located below the material conveying chute (301), and there is a boiling plate between the two. The material conveying chute (301) and the air conveying chute (302) are connected through ventilation holes on the boiling plate.

4. The multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification according to claim 2, characterized in that: The air supply pipe includes a main air supply pipe (4), a first air supply pipe (9) and a second air supply pipe (10). The main air supply pipe (4) is connected to the first pneumatic chute (3), the first air supply pipe (9) and the second air supply pipe (10). The first air supply pipe (9) is connected to the second pneumatic chute (6). The second air supply pipe (10) is connected to the third pneumatic chute (8).

5. The multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification according to claim 4, characterized in that: The first air supply pipe (9) is connected to a branch pipe (1401) of the air inlet pipe (14), the air outlet duct (302) is connected to a first connecting pipe (1403), the first connecting pipe (1403) is equipped with a first valve (1404), and a first flexible hose (1402) is installed between the first connecting pipe (1403) and the branch pipe (1401).

6. The multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification according to claim 3, characterized in that: A bypass connector (303) is connected to the side of the material feeding chute (301), and a bypass discharge pipe (7) is connected between the bypass connector (303) of the upper pneumatic chute and the bypass connector (303) of the lower pneumatic chute.

7. The multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification according to claim 3, characterized in that: The feeding structure is located on the side of the feeding chute (301). The feeding structure includes a material distribution bin (304). The material distribution bin (304) is open on the side and connected to the feeding chute (301). A slit (305) is provided on the side wall of the feeding chute (301). A baffle (306) is slidably contacted on the outer side wall of the feeding chute (301). The baffle (306) is positioned corresponding to the slit (305). An actuating component (307) is connected to the baffle (306).

8. The multi-layer, multi-point uniform feeding device for adsorbent in electrolytic flue gas purification according to claim 7, characterized in that: The actuating component (307) is one of the following: manual opening and closing structure, pneumatic opening and closing structure, hydraulic opening and closing structure, or electric opening and closing structure.

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